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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56c70d21e3dc8f4a5cd0f44d8ec5611773cd42a5fc53072bb1e5394ce20d92fb' 
  AND token = 's9wdkS79ZPLr/0PrTlcn3L3HQhM76e+sVV8D+50OqgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}